You’ve done something wrong when you tried to do the verification. It looks like you’ve changed the URL of your site from the domain name to the full URL of the Google verification page. To fix that, have a look at Changing The Site URL. There’s a few different ways to fix it there, so see which one works best for you.

When you get that back to where it’s meant to be, don’t change the URL again!

The Google verification process should only need you to upload the file to your sites file system. Once it’s there your site can be verified. You don’t need to change anything within WordPress itself. 🙂